Seeding data to database using SQLAlchemy and FastAPI

seeding.py

# The simplest solution I found is to set up an event for each table that executes a method after the table is created.

# Database initial data
INITIAL_DATA = {
      'users': [
            {
                  'username': 'superuser',
                  'email': 'superuser@example.com',
                  'hashed_password': hash_password('123')
            },
            {
                  'username': 'admin',
                  'email': 'admin@example.com',
                  'hashed_password': hash_password('123')
            }
      ],
      'sometable': [
            {'column1': 'value', 'column2': 'value'}
      ]
}

# This method receives a table, a connection and inserts data to that table.
def initialize_table(target, connection, **kw):
    tablename = str(target)
    if tablename in INITIAL_DATA and len(INITIAL_DATA[tablename]) > 0:
        connection.execute(target.insert(), INITIAL_DATA[tablename])

# In main.py
from sqlalchemy import event
from models.users import User
from models.sometable import SomeTable

# I set up this event before table creation
event.listen(User.__table__, 'after_create', initialize_table)
event.listen(SomeTable.__table__, 'after_create', initialize_table)

app = FastAPI()

# ....

# This will create the DB schema and trigger the "after_create" event
@app.on_event("startup")
def configure():
    Base.metadata.create_all(bind=engine)

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)